Can not dump exif_dict : dump got wrong type of exif value. 50728 in should be Rational instead of Short

[ThePMO]

I'm having problems with loading and dumping the exif data from my Insta360 camera.

This issue is similar to #95 and #83

The source of the problem is that piexif expects SHORT values for tag 50728 (As Shot Neutral), but the values in the file are rationals.
https://exiv2.org/tags.html does specify this tag as a short type, but exiftool uses rationals, so I assume the latter is true.